Arpactophilus drubea, Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016

Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016, A review of the New Caledonian Arpactophilus (Hymenoptera: Crabronidae), Zootaxa 4063 (1), pp. 1-66 : 22-23

Arpactophilus drubea sp. nov.

( Figs. 49–50 )

Diagnosis. Arpactophilus drubea is the only New Caledonian species in the genus with the combination of one submarginal cell in the forewing, a clypeus with the apical half yellow, yellow markings on the lower frons, a head almost as broad as long, a dorsally-interrupted occipital carina, and a roughly reticulate dorsal surface to the propodeum.

Description. FEMALE: Total length 3.2–3.5 mm, mean = 3.4 mm; forewing length 1.8–2.2 mm, mean = 2.0 mm.

Body black, with areas of dark and light yellow. Light yellow: apical half of clypeus ( Fig. 49 ); labrum; mandible; palpi; front of scape; pedicel; area on lower frons between base of scape and inner compound eye margin ( Fig. 49 ); anterior pronotal margin; pronotal lobe; tegula; coxae apically (in some specimens almost completely); trochanters; femora; tibiae; tarsi. Dark yellow: posterior of scape; flagellum. Wings hyaline; pterostigma light brown.

Head about as long as wide in frontal view. Apical margin of clypeus medially projecting, with shallow, broad concave incision ( Fig. 49 ). Apical margin of labrum with two lobes. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 4:3. Frons colliculate with dense punctation and dense short setae. Frontal carina present from median ocellus to midlength of clypeus, forming a point at basal clypeal margin. Scape 3.4 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by approximately their diameter. Occipital carina interrupted dorsally ( Fig. 6 ). Gena colliculate with sparse, long setae ventrally, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate with bordering sparse and short transverse carinulae on hypostomal integument, not angulate.

Mesosoma about 1.7 × as long as wide in dorsal view. Propodeum about 0.8 × as long as wide in dorsal view. Mesosoma imbricate with dense punctation ( Fig. 50 ), except dorsal surface of propodeum; lateral surface of propodeum also transversely carinulate; dorsal surface of propodeum coarsely reticulate (similar to pattern in Fig. 19 ). Pitted sulcus present posterior to fine mesoscuto-mesoscutellar sulcus. Hypersternal sulcus barely present, only as a small linear impression close to omaulus. Metafemur 2.7 × as long as wide. Metatibia without differently colored area apically. Pretarsal claws without teeth. Forewing with one submarginal cell. Hind wing with five distal hamuli.

Metasoma polished, sparsely punctate ( Fig. 50 ). Metasomal sternum II without bulge (as in Fig. 1 ). Pygidium with broad row of silk setae apically.

MALE: As in female except in genitalic structures. Metasomal sternum VIII narrow.

Remarks. Arpactophilus drubea is similar to A. drehu but they can be distinguished by the extent of the occipital carina, which is continuous in the latter. This species has a broader head and coarser dorsal surface to the propodeum than A. cemuhi , and differs from A. caledonicus in the yellow markings on the clypeus and frons.

Material examined. HOLOTYPE ♀: “Nouvelle Calédonie, Pindaï 30m, 18.IV.1995, Réc. Chazeau & Jourdan” [ MNHN].

PARATYPES 8♀, 1♂: ♀: (3x) “Nouvelle Calédonie, Pindaï 30m, 18.IV.1995, Réc. Chazeau & Jourdan” [ CAS]; (3x) “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [ ZMB]; (1x) “Nouvelle Calédonie, Mont Koghis. 350m, 3.V.1995, Réc. Chazeau & Jourdan, Coll. Tussac” [ MNHN]. ♂: “Nouvelle Calédonie, Mont Koghis. 350m, 3.V.1995, Réc. Chazeau & Jourdan, Coll. Tussac” [ MNHN]. Etymology. The specific epithet is taken from the name Drubea , one of the New Caledonian native languages. It is treated as a noun in apposition.

Figures

FIGURES 47 – 52. Facial views and lateral habitus of ♀ holotypes of species of Arpactophilus Smith. 47. Arpactophilus drehu sp. nov., facial view; 48. A. drehu, lateral habitus; 49. A. drubea sp. nov., facial view; 50. A. drubea, lateral habitus; 51. A. fagauvea sp. nov., facial view; 52. A. fagauvea, lateral habitus.

FIGURES 5 – 9. Head and metatibial details of New Caledonian Arpactophilus Smith. 5. Schematic view of posterior of head of Arpactophilus, arrow indicates complete occipital carina; 6. Schematic with arrow indicating incomplete, dorsallyinterrupted occipital carina; 7: Metatibia of holotype ♀ of A. xaragure sp. nov., arrow indicating slightly differently colored but not differently-structured area apically; 8. Metatibia of holotype ♀ of Arpactophilus orowe sp. nov., arrow indicating differently colored and structured area apically; 9. Metatibia of paratype ♀ of A. orowe, scanning electron micrograph with arrow indicating concave area apically.

FIGURES 16 – 22., Dorsal surfaces of ♀ of species of Arpactophilus Smith. 16. Arpactophilus concavus Bohart; 17. A. irwini Bohart; 18. A. kumak sp. nov. (holotype); 19. A. merle sp. nov. (holotype); 20. A. caac sp. nov. (holotype); 21. A. kraussi Bohart; 22. A. propodealis Bohart.

FIGURES 1 – 4. Line drawings of metasomata and forewings of New Caledonian species of Arpactophilus Smith. 1. Metasoma in profile of ♀ of Arpactophilus merle sp. nov., arrow indicates unmodified metasomal sternum II; 2. Metasoma in profile of ♀ of A. irwini Bohart, arrow indicates ventrally swollen metasomal sternum II. 3. Forewing of ♀ of A. irwini; ps: pterostigma, sz I: submarginal cell I, sz II: submarginal cell II. 4, Forewing of ♀ of A. caledonicus Bohart; ps: pterostigma, sz I: submarginal cell I.